Yet again, as Spurs looked to progress under Thomas Frank, they came crashing down in arguably their worst performance of the season.
Defeats to Arsenal, Bournemouth and Fulham have been poor - chastening at times, especially to the Gunners - but the surrender at the City Ground could be labelled as a further low.
They were second best throughout and did little to suggest they are able to move forward in their present state.
Guglielmo Vicario's first mistake - passing to put Archie Gray under too much pressure from Ibrahim Sangare and allowing Callum Hudson-Odoi to score - was bad, but the tone had already been set.
Forest pressed and were richly rewarded. Tottenham had no answer. Richarlison was anonymous, as was Xavi Simons, and Premier League debutant John Victor was completely untroubled in the home goal.
Frank will need to defend his goalkeeper again but the whole team deserves criticism as they failed to handle an energised Forest.